I, Ishua, was expelled for the unreasonable reason of being a 'useless' mana supplier to the party. The hero, who was supposed to carry the world's hope, expelled me. A mana porter is a crucial job in a party, supplying mana to those who are lacking. After my expulsion, however, Aria, the saint from the hero's party and my junior from our adventurer training days, came running after me. She confessed her regret at abandoning me and insisted on following me, stating that the hero's party was barely surviving thanks to me. Thus began my journey with the saint. Meanwhile, the hero's party was facing a crisis. The hero, who had arbitrarily expelled Ishua, was being blamed by the other members, who all understood Ishua's importance. Despite this, the hero tried to forcefully proceed with the A-rank dungeon conquest, but with two members gone, the party quickly ran out of mana. Dark clouds loomed over the hero's party.